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M dwarf companions to white dwarfs I: relating magnetic activity, rotation and age
A. Rebassa-Mansergas, M. R. Schreiber, B. T. Gaensicke
We make use of the largest and most homogeneous sample of white dwarf/M dwarf (WD/dM) binaries from the Sloan Digital Sky Survey (SDSS DR7) to investigate relations between magneti…
Remarkable spectral variability on the spin period of the accreting white dwarf in V455 And
S. Bloemen, D. Steeghs, K. De Smedt +4
We present spin-resolved spectroscopy of the accreting white dwarf binary V455 And. With a suggested spin period of only 67s, it has one of the fastest spinning white dwarfs known.…
NLTT5306: The shortest Period Detached White Dwarf + Brown Dwarf Binary
P. R. Steele, R. P. Saglia, M. R. Burleigh +6
We have spectroscopically confirmed a brown dwarf mass companion to the hydrogen atmosphere white dwarf NLTT5306. The white dwarf's atmospheric parameters were measured using Sloan…
IPHAS J062746.41+014811.3: a deeply eclipsing intermediate polar
A. Aungwerojwit, B. T. Gänsicke, P. J. Wheatley +4
We present time-resolved photometry of a cataclysmic variable discovered in the Isaac Newton Telescope Photometric Halpha Survey of the northern galactic plane, IPHAS J062746.41+01…
Spectroscopic follow-up of UV-excess objects selected from the UVEX survey
Kars Verbeek, Paul J. Groot, Simone Scaringi +17
We present the results of the first spectroscopic follow-up of 132 optically blue UV-excess sources selected from the UV-excess survey of the Northern Galactic Plane (UVEX). The UV…
Scars of Intense Accretion Episodes at Metal-Rich White Dwarfs
J. Farihi, B. T. Gänsicke, M. C. Wyatt +3
A re-evaluation of time-averaged accretion rates at DBZ-type white dwarfs points to historical, time-averaged rates significantly higher than the currently observed episodes at the…